GPS signals are below the noise floor, so it wouldn't take much power to spoof them. You just have to get the gold codes correct (http://en.wikipedia.org/wiki/G

GPS signals are below the noise floor, so it wouldn't take much power to spoof them. You just have to get the gold codes correct (http://en.wikipedia.org/wiki/Gold_code http://en.wikipedia.org/wiki/Gold_code).